M29W040B datasheet(2/20 Pages) STMICROELECTRONICS

2 / 20 page

M29W040B

2/20

Figure 2. PLCC Connections

AI02951

A13

A10

DQ0

DQ7

A14

M29W040B

A11

Figure 3. TSOP Connections

DQ0

A13

A10

DQ7

A14

A11

DQ5

DQ1

DQ2

DQ3

DQ4

DQ6

A17

A16

A12

A18

VCC

A15

AI02952

M29W040B

VSS

Table 1. Signal Names

A0-A18

Address Inputs

DQ0-DQ7

Data Inputs/Outputs

Chip Enable

Output Enable

Write Enable

VCC

Supply Voltage

VSS

Ground

SUMMARY DESCRIPTION

The M29W040B is a 4 Mbit (512Kb x8) non-vola-

tile memory that can be read, erased and repro-

grammed. These operations can be performed

using a single low voltage (2.7 to 3.6V) supply. On

power-up the memory defaults to its Read mode

where it can be read in the same way as a ROM or

EPROM. The M29W040B is fully backward com-

patible with the M29W040.

The memory is divided into blocks that can be

erased independently so it is possible to preserve

valid data while old data is erased. Each block can

be protected independently to prevent accidental

Program or Erase commands from modifying the

memory. Program and Erase commands are writ-

ten to the Command Interface of the memory. An

on-chip Program/Erase Controller simplifies the

process of programming or erasing the memory by

taking care of all of the special operations that are

required to update the memory contents. The end

of a program or erase operation can be detected

and any error conditions identified. The command

set required to control the memory is consistent

with JEDEC standards.

Chip Enable, Output Enable and Write Enable sig-

nals control the bus operation of the memory.

They allow simple connection to most micropro-

cessors, often without additional logic.

The memory is offered in TSOP32 (8 x 20mm),

TSOP32 (8 x 14mm) and PLCC32 packages and

it is supplied with all the bits erased (set to ‘1’).

In order to meet environmental requirements, ST

offers the M29W040B in ECOPACK® packages.

ECOPACK packages are Lead-free. The category

of second Level Interconnect is marked on the

package and on the inner box label, in compliance

with JEDEC Standard JESD97. The maximum rat-

ings related to soldering conditions are also

marked on the inner box label.

ECOPACK is an ST trademark. ECOPACK speci-

fications are available at: www.st.com.

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